How to automate rendering of the same object with different textures?
Name your texture files as a sequence if they aren't, like this:

0001
0002
0003
0004
....


In the material editor, choose Image Sequence instead of Single Image and choose all your textures. If you are using using the Node Wrangler addon, you can add them through the add menu, Texture >> Image Sequence.



Set the end frame to the number of texture you have, and render the scene as an animation and you will get your model with different texture for each frame.